15
my numbers has an (L.C.M.) lowest common multiple

The (L.C.M.) of 15 and 30 is 30. A definition of the lowest
common multiple is the least multiple that two or more
numbers share. Common multiples of 6 and 8 include
24, 48, and 72 but 24 is the least Common Multiple.
How you can get the lowest common multple is you
get two numbers and list multiples of both numbers until
you find the lowest common multiple.
Definiton: The least multiple that two or more numbers
share. Common multiples of 6 and 8 include 24, 48, and 72,
but 24 is the least common multiple.